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Process for production of propylene oxide

A technology of propylene oxide and manufacturing method, which is applied in the direction of organic chemical method, preparation of peroxygen compound, chemical instrument and method, etc., to achieve the effects of preventing activity reduction, maintaining catalyst life, and prolonging catalyst life

Inactive Publication Date: 2005-05-04
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because using this method, when producing propylene oxide, there must be styrene by-product, so from the viewpoint of selectively obtaining only propylene oxide, it is unsatisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A cumene solution containing 25% by weight of cumyl alcohol was reacted with hydrogen through a reactor packed with a copper-chromium catalyst. At this time, the total concentration of formic acid and acetic acid in the cumene solution was 10 ppm by weight. Molar ratio of hydrogen to cumyl alcohol is 8, LHSV of cumene solution = 1.5 hours -1 , the reaction pressure is 1MPa-G (gauge pressure). In the reaction of cumyl alcohol, only cumene is produced. The results are shown in Table 1.

Embodiment 2

[0024] The same method as in Example 1 was carried out, except that the total concentration of formic acid and acetic acid in the cumene solution used for the reaction was 40 ppm by weight. The results are shown in Table 1.

Embodiment 3

[0026] The same method as in Example 1 was carried out, except that the total concentration of formic acid and acetic acid in the cumene solution used for the reaction was 100 ppm by weight. The results are shown in Table 1.

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PUM

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Abstract

A process for producing propylene oxide, comprising the following steps: oxidation step: a step of obtaining cumene hydroperoxide by oxidizing cumene; epoxidation step: a step of obtaining propylene oxide and cumyl alcohol by reacting a cumene solution containing cumene hydroperoxide with an excess of propylene in a liquid phase in the presence of a solid catalyst; and hydrogenolysis step: a step of obtaining cumene through hydrogenolysis of cumyl alcohol obtained in the epoxidation step, and recycling the cumene to the oxidation step as the raw material of the oxidation step, wherein the concentration of organic acids in cumyl alcohol supplied to the hydrogenolysis step is adjusted to 200 ppm by weight or less.

Description

technical field [0001] The present invention relates to a method for producing propylene oxide. More specifically, the present invention relates to a method for producing propylene oxide which has the following excellent characteristics: propylene can be epoxidized to convert propylene oxide into desired propylene oxide without co-producing styrene, and can be used repeatedly to form a ring Oxidizing. Oxygen-supported cumene used can also prevent a decrease in activity due to poisoning of the solid catalyst used in the hydrogenolysis step, and can maintain a long catalyst life. Background technique [0002] The method of oxidizing propylene with ethylbenzene hydroperoxide as an oxygen carrier to obtain propylene oxide and styrene is called the Halcon method. This method is unsatisfactory from the viewpoint of selectively obtaining only propylene oxide because styrene by-product is inevitably produced at the same time as propylene oxide. SUMMARY OF THE INVENTION [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07B61/00C07C1/22C07C15/085C07C29/132C07C33/20C07C407/00C07C409/10C07D301/19C07D303/04
CPCC07D301/19Y02P20/584Y02P20/52
Inventor 辻纯平
Owner SUMITOMO CHEM CO LTD
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